Here are the answers to your questions based on the information regarding the Dawes Act:
Question 1: Under the Dawes Act, how many acres of land was a Native American head of household to receive?
Answer: A. 160 acres
Question 2: If a Native American lived on their allotted land for 25 years, what would he/she have to do to get their U.S. citizenship?
Answer: D. become "civilized"
Question 3: To whom did the government sell much of the best, most farmable land?
Answer: B. non-Indians
If you need further information or explanations, feel free to ask!